diff options
| author | Mel Gorman <mgorman@suse.de> | 2013-10-07 11:29:05 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-09 12:40:32 +0200 |
| commit | 1bc115d87dffd1c43bdc3c9c9d1e3a51c195d18e (patch) | |
| tree | 56a26b4f4fe089e3dd1df5a26877d1e4c0114d35 /include | |
| parent | 9ff1d9ff3c2c8ab3feaeb2e8056a07ca293f7bde (diff) | |
mm: numa: Scan pages with elevated page_mapcount
Currently automatic NUMA balancing is unable to distinguish between false
shared versus private pages except by ignoring pages with an elevated
page_mapcount entirely. This avoids shared pages bouncing between the
nodes whose task is using them but that is ignored quite a lot of data.
This patch kicks away the training wheels in preparation for adding support
for identifying shared/private pages is now in place. The ordering is so
that the impact of the shared/private detection can be easily measured. Note
that the patch does not migrate shared, file-backed within vmas marked
VM_EXEC as these are generally shared library pages. Migrating such pages
is not beneficial as there is an expectation they are read-shared between
caches and iTLB and iCache pressure is generally low.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-28-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/migrate.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 8d3c57fdf22..f5096b58b20 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -90,11 +90,12 @@ static inline int migrate_huge_page_move_mapping(struct address_space *mapping, #endif /* CONFIG_MIGRATION */ #ifdef CONFIG_NUMA_BALANCING -extern int migrate_misplaced_page(struct page *page, int node); -extern int migrate_misplaced_page(struct page *page, int node); +extern int migrate_misplaced_page(struct page *page, + struct vm_area_struct *vma, int node); extern bool migrate_ratelimited(int node); #else -static inline int migrate_misplaced_page(struct page *page, int node) +static inline int migrate_misplaced_page(struct page *page, + struct vm_area_struct *vma, int node) { return -EAGAIN; /* can't migrate now */ } |